<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style>
	.d1{
		width:700px;
		height:700px;
	
	 }
	 .d2{ margin-bottom:20px;
	 background-color:red;
	 width:700px;
	 height:200px;
	 float:left;
		 }
	.d3{
		background-color:blue;
		 width:200px;
		 height:500px;
		 margin-right:20px;
		 float:left;
		 }
	
    .d4{
		background-color:green;
		 width:480px;
		 height:500px;
		 float:left;
		 }


</style>
</head>

<body>
<div class="d1">

    <div class="d2"></div>
    <div class="d3"></div>
    <div class="d4"></div>


</div>
</body>
</html>
